Commit 5a70dca3 authored by Juanma Barranquero's avatar Juanma Barranquero
Browse files

(ruler-mode): Prevent clobbering the original `header-line-format'

when reentering ruler mode.
parent 9b40e204
......@@ -29,7 +29,7 @@
;;; Commentary:
;; This library provides a minor mode to display a ruler in the header
;; line. It works only on Emacs 21.
;; line. It works from Emacs 21 onwards.
;; You can use the mouse to change the `fill-column' `comment-column',
;; `goal-column', `window-margins' and `tab-stop-list' settings:
......@@ -562,7 +562,8 @@ Call `ruler-mode-ruler-function' to compute the ruler value.")
;; When `ruler-mode' is on save previous header line format
;; and install the ruler header line format.
(when (local-variable-p 'header-line-format)
(when (and (local-variable-p 'header-line-format)
(not (local-variable-p 'ruler-mode-header-line-format-old)))
(set (make-local-variable 'ruler-mode-header-line-format-old)
(setq header-line-format ruler-mode-header-line-format)
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